Air-heating furnace



(No Model.)

J. M. HESS.

AIR HEATING FURNACE. No. 334,661. Patented Jan. 19, 1886.

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" NITED STATES PATENT OFFICE.

JOHN M. HEss, on PHILADELPHIA, PENNSYLVANIA.

AIR-HEATING FURNACE.

SPECIFICATION forming part of Letters Patent No. 334,661, dated January 19, 1886.

Application filed November 14, 1884. Serial No.147,971. (No model.)

To all whom, it may concern:

Be it known that 1, JOHN M. HESS, a citizen of the United States, residing in the city and county of Philadelphia, and State of Pennsylvania, have invented a new and useful Improvement in Air-Heating Furnaces, of which the following is a specification.

The object of my invention is, to construct an air-heating furnace so that the warm air may be more equally distributed to the heateduction pipes; and it consists in introducing a cold-air pipe into and up through the center of the main heating-cylinder, and arranging the upper end of the same so that the current of pure cold air admitted from the outside of the building, after being warmed,is thoroughly distributed through the hot-air chamber.

Reference is had to the accompanying drawings, in which Figure 1 is a side elevation of my improvement in air-heating furnaces,with a portion of the inner and outer casing removed. Fig. 2 is a plan view on the line a b of Fig. 1. Fig. 3 is a vertical section through the heating chamber and cylinders. Fig. 4 is a plan view, detached, of the cold-air opening at the base of the furnace. Fig. 5 is a sectional view of the upper portion of the center or main heating-cylinder.

A, Figs. 1, 2', and 3, is the conical heatingchamber placed in an inverted position on the cylinder or fire-pot B, and provided with a neck, a, which fits over and is secured to the annular projection on the upper end of the said fire-pot.

C is the main heating-cylinder, closed at the upper end and placed in a vertical position over an opening, b, made in the center of the conical heating-chamber A, as shown in Fig. 3.

0, O O and O are a series of smaller heating-cylinders surrounding the main cylinder G, with their upper ends closed, and the lower ends opening into the conical heatingchamber A through the inclined pipes D, D, D", and D The said cylinders 0, G G and O are also connected near their upper ends by means of inclined pipes D, D", D, and D, for the passage of heat and smoke.

E, E, E and E Figs. 1 and 2, are tubes leading vertically through the conical heatingchamber, to allow air to pass through to be more thoroughly heated.

F, Fig. 3, is a cone-shaped heat-deflector,

suspended in each of the smallerheating-cylinders, to check the heat as much as possible from passing out the smoke-pipe.

G, Figs. 1, 2, and 3, is a cold-air pipeleading'from the outside of the heater and up through the center of the main heating-cylinder 0, and into the hot-air chamber H, for the purpose of admitting a current of pure air to be heated. The heating-cylinders are inclosed by the ordinary outer casing and in side lining of sheet-iron to form the hot-air chamber H, and also with a heat-dome provided with the usual heat-distributing pipes.

In arranging the conical heating-chamber and cylinders, as described, an increased amount of heat-radiating surface is procured. The heat from the products of combustion passing from the fire-cylinder through the conical heating-chamber is radiated from the same to assist, in connection with the firecylinder, in heating the surrounding air of less temperature admitted through the open ing I at the base.

The inclined pipes D, D, D and D which connect the lower ends of the cylinders 0, C C and (1 with the heating-chamber A, may be of cast-iron, with the outer ends flared to suit the inside diameter of the cylinders. The object in placing these pipes, and also the pipes D, D D and D, at an incline isto avoid right-angle projections and fiat surfaces, upon which dirt or soot is liable to collect.

To clean the cylinders, if necessary, a slight blow or rap upon the outside of each cylinder will dislodge any accumulation of dust or soot, and the inclination of the pipes and the inclined sides of the heating-chamber A will permit the refuse matter to pass freely down into the fire-chamber. The cap J, inclosing the upper end of the main heating-cylinder O, is depressed or dished in the center, and a conical plate, J, is secured a short distance above the same and over the open end of the pipe G, for the heat to impinge upon and scatter through the hot-air chamber.

K, Fig. 4, is a triangular partition placed opposite the cold-air entrance I at the base of the furnace, to cause the air to diverge to the right and left and pass thoroughly around the base of the fire-pot.

The smoke-pipe 0, Fig. 1, is provided with a double elbow, P and P, provided with open ends and adjustable caps or registers R and R, to check the draft when necessary, and also to ventilate the cellar.

I am aware that radiators and heat-domes have heretofore been in use, and that they have been arranged directly on the fire-pot, or connected with the same by means of pipes or flues, and that they have been made cylindrical and cone-shaped, and that cold airhas been introduced and brought in contact with the radiators to be heated; hence I do not wish to broadly claim the use of radiators, heat or cold-air conducting pipes in connection with air-heating furnaces.

Having described my invcntion,whatI claim, 15 and desire to secure by Letters Patent, is-

The combination of the fire-pot B, heatingeylinder O,provided with a dished end, J, airpipe G, and conical plate J, to thoroughly diffuse the warm pure air issuing from the 20 upper end of the pipe G, substantially as shown and described.

JOHN M. HESS.

\Vitnesses:

CHARLES H. MINTZER, ISAAC R. OAKFORD. 

